* Add ability to upload image handouts

* Extend handouts allowed file types list

* Refactor uploading file extension check, cover it with unittests

* Reimplement population fields with default values

* Cover with unittest 3PlayMedia get_3pm_transcripts_list API failure case

* Cover with unittests subdomain fatching utility

* Refactor XBLOCK_SETTINGS format

* Merge branch 'dev' of https://github.com/raccoongang/xblock-video into 257-configurable-player-id

* Fix code review complaints

… (#252)

* Add basic "direct" 3PlayMedia transcript functionality

* Add proxy transcript fetching handler

* Fix unit-tests

* Add js 3PlayMedia credentials validation draft

* Implement validation handler of 3PlayMedia configuration

* Refactor: direct_enabled >> threeplaymedia_streaming

* Change threeplaymedia_streaming field scope

* Fix typo

* Fix code review complaints

* Improve test-py coverage

* Make utility interface consistent

* Fix 3PlayMedia validation handler

* Fix exception cases

* Fix BrightCove authentication error

* Refactor validation of 3PlayMedia options

* Fix unicode chars in token error

* Remove deprecated 3PlayMedia transcript loading

* Add debug logging for default transcripts updating

* Refactor 3PlayMedia utilities interface, fix tests, fix quality

* Fix variables naming

* Add unit test for 3PlayMedia API failure case

* Add unit test for 3PlayMedia validation handler: positive test case

* Cover with unit tests 3PlayMedia validation handler

* Add additional transcripts configuration hint for staff

* Refactor error message variable

* Refactor Wistia "get_default_transcripts"

* Fix UI message to inform users about the absence of transcripts to upload

* Handle transcript uploading failure case

* Fix Wistia API single transcript downloading URL

* Refactor transcript downloading to be performed uniformly with other backends

* Fix unit tests: must be simplified

* Get rid of unified Wistia Player unit tests

* Cover with unit tests Wistia's player.get_default_transcripts

* Remove obsolete constant

* Revert error details message

* Improve undefined-check

* Fix code style

* Move request arrange test utility to base test module

* Extend list of captured exceptions in Wistia transcript downloading method

* Cover with unit tests Wistia backend

* Make settings.configure globally once

* Cover with unit tests Wistia backend (failure case)

* Fix unit-tests naming

* Cover with unittest wistia_player.get_default_transcripts completely

* Improve enabled transcripts fetching

* Add token field to transcripts-related field set

* Extend list of errors while handling transcripts

* Partially revert field rendering template logic in accordion

* Fix unittests, quality

* Cover with unittests video_xblock.get_enabled_transcripts

* Fix quality complaints

* Fix default&manual transcripts accordion section

* Clearify doc strings

* Add docstrings to every python test

* Remove assertion check, add transcripts terms definitions

* Fix minor code review complaints

* Simplify BrightcovePlayer.dispatch()

* Cover with unit test Brightcove default transcripts fetching

* Add handouts allowed file type list to README

* Describe new XBLOCK_SETTINGS

* Describe release changes

…275)

* Refactor xBlock fields filling; revert XBLOCK_SETTINGS structure

* Fix code quality

- remove arrow button
- turn off menu showing on hover

* Make transcripts indexable for LMS search

* Fix javascript unit tests

* Normalize retranscode studio editor section

* Add Brightcove API retranscode error handling

* Disable native transcripts

* Fix potential erroneous spot

* Update development deps environment

…lue>', which breaks the authorization header - remove the 'encode' call

…terable) instead

….encode('utf-8') - all strings are unicode in python 3, and nothing is gained by encoding them to bytes-representations.

…mplates (#410)

Co-authored-by: Glib Glugovskiy <glib.glugovskiy@raccoongang.com>

…estriction EDLY-2810 (#8)

… breaks VideoJS5 but that's getting very old

Must be specified using inline style or class if using % width
https://player.support.brightcove.com/styling/sizing-player.html